docs: def create_keys_in():
      """ Create a grammer for the 'KEYS IN' clause used for queries """
      keys = Group(
          Optional(Suppress("("))
          + value
          + Optional(Suppress(",") + value)
          + Optional(Suppress(")"))
      )
      return (Suppress(upkey("keys") + upkey("in")) + delimitedList(keys)).setResultsName(
          "keys_in"
      )